It is illustrated how computational modelling techniques are used at Corus RD&T as a means to investigate and improve fume emission, air quality and heat control throughout the steel processing route. Some of the recent areas that have benefited from such models are: the redesign of a coater line room, a storage and production facility and fume capture during iron desulphurisation and casting. The modelling techniques, the challenges of using such models and the results are summarised.